package/utils/busybox/patches/002-upstream_ash_fix.patch

   1 --- a/shell/ash.c
   2 +++ b/shell/ash.c
   3 @@ -13014,7 +13014,7 @@ init(void)
   4                 setvar2("PPID", utoa(getppid()));
   5  #if ENABLE_ASH_BASH_COMPAT
   6                 p = lookupvar("SHLVL");
   7 -               setvar2("SHLVL", utoa(p ? atoi(p) + 1 : 1));
   8 +               setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT);
   9  #endif
  10                 p = lookupvar("PWD");
  11                 if (p) {